We have one area on the backside of the dam about 10 feet wide and 25-30 feet long where water perks right through. If you push down anywhere the water pools around the area except when it is extremely dry. I'm thinking an application to the water side of the dam in about a 30 foot radius might work. Our water level stays pretty static but never gets above a certain point. If we gain a few inches with rain it is gone in a day or so and back to the normal level. Seems anything above the static water line seeps out pretty quickly. Makes me think the leak is actually above the normal water line. That said, the natural water line should probably be about 1 - 2 feet higher.
